// Copyright David Abrahams 2002.

// Distributed under the Boost Software License, Version 1.0. (See

// accompanying file LICENSE_1_0.txt or copy at

// http://www.boost.org/LICENSE_1_0.txt)

#ifndef PROXY_DWA2002615_HPP

# define PROXY_DWA2002615_HPP

# include <boost/python/detail/prefix.hpp>

# include <boost/python/object_core.hpp>

# include <boost/python/object_operators.hpp>

namespace boost { namespace python { namespace api {

template <class Policies>

class proxy : public object_operators<proxy<Policies> >

{

    typedef typename Policies::key_type key_type;

# if !defined(BOOST_MSVC) || BOOST_MSVC >= 1300

    typedef proxy const& assignment_self;

# else

    typedef proxy assignment_self;

# endif

 public:

    proxy(object const& target, key_type const& key);

    operator object() const;

    // to support a[b] = c[d]

    proxy const& operator=(assignment_self) const;

    template <class T>

    inline proxy const& operator=(T const& rhs) const

    {

        Policies::set(m_target, m_key, object(rhs));

        return *this;

    }

 public: // implementation detail

    void del() const;

 private:

    object m_target;

    key_type m_key;

};

template <class T>

inline void del(proxy<T> const& x)

{

    x.del();

}

//

// implementation

//

template <class Policies>

inline proxy<Policies>::proxy(object const& target, key_type const& key)

    : m_target(target), m_key(key)

{}

template <class Policies>

inline proxy<Policies>::operator object() const

{

    return Policies::get(m_target, m_key);

}

// to support a[b] = c[d]

template <class Policies>

inline proxy<Policies> const& proxy<Policies>::operator=(typename proxy::assignment_self rhs) const

{

    return *this = python::object(rhs);

}

# define BOOST_PYTHON_PROXY_INPLACE(op)                                         \

template <class Policies, class R>                                              \

proxy<Policies> const& operator op(proxy<Policies> const& lhs, R const& rhs)    \

{                                                                               \

    object old(lhs);                                                            \

    return lhs = (old op rhs);                                                  \

} 

BOOST_PYTHON_PROXY_INPLACE(+=)

BOOST_PYTHON_PROXY_INPLACE(-=)

BOOST_PYTHON_PROXY_INPLACE(*=)

BOOST_PYTHON_PROXY_INPLACE(/=)

BOOST_PYTHON_PROXY_INPLACE(%=)

BOOST_PYTHON_PROXY_INPLACE(<<=)

BOOST_PYTHON_PROXY_INPLACE(>>=)

BOOST_PYTHON_PROXY_INPLACE(&=)

BOOST_PYTHON_PROXY_INPLACE(^=)

BOOST_PYTHON_PROXY_INPLACE(|=)

# undef BOOST_PYTHON_PROXY_INPLACE

template <class Policies>

inline void proxy<Policies>::del() const

{

    Policies::del(m_target, m_key);

}

}}} // namespace boost::python::api

#endif // PROXY_DWA2002615_HPP